Messages in this thread | | | Subject | Re: [PATCH] perf events, x86: Add SandyBridge stalled-cycles-frontend/backend events | From | Lin Ming <> | Date | Fri, 06 May 2011 15:43:41 +0800 |
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On Fri, 2011-05-06 at 15:38 +0800, Ingo Molnar wrote: > * Lin Ming <ming.m.lin@intel.com> wrote: > > > Extend the Intel SandyBridge PMU driver with definitions > > for generic front-end and back-end stall events. > > > > ( As commit 3011203 says, these are only approximations. ) > > > > Signed-off-by: Lin Ming <ming.m.lin@intel.com> > > --- > > arch/x86/kernel/cpu/perf_event_intel.c | 6 ++++++ > > 1 files changed, 6 insertions(+), 0 deletions(-) > > > > diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c > > index c1ec7a5..61cbf48 100644 > > --- a/arch/x86/kernel/cpu/perf_event_intel.c > > +++ b/arch/x86/kernel/cpu/perf_event_intel.c > > @@ -1485,6 +1485,12 @@ static __init int intel_pmu_init(void) > > > > x86_pmu.event_constraints = intel_snb_event_constraints; > > x86_pmu.pebs_constraints = intel_snb_pebs_events; > > + > > + /* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */ > > + intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = 0x180010e; > > + /* UOPS_DISPATCHED.THREAD,c=1,i=1 to count stall cycles*/ > > + intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = 0x18001b1; > > + > > Nice! > > Could you check Intel Atom perhaps as well, does it have any useful event to > approximate this?
OK, let me check.
> > Thanks, > > Ingo
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